Update react-native-markdown-renderer library (#27901)

react-native-markdown-renderer is no longer being updated. It has
stopped supporting React 17 or above. Updated the library to use a fork
of react-markdown-renderer that is still being updated and supports the
latest version of React.

docs/pages/guides/editing-richtext.mdx

@@ -13,7 +13,7 @@ There’s currently no default solution for that in the React Native ecosystem.
 
 There are a lot of good options to display rich text:
 
-- For markdown content, you can use a markdown renderer such as [`react-native-markdown-renderer`](https://www.npmjs.com/package/react-native-markdown-renderer) or another.
+- For markdown content, you can use a markdown renderer such as [`react-native-markdown-display`](https://www.npmjs.com/package/react-native-markdown-display) or another.
 
 - For HTML content, you can use [`@expo/html-elements`](https://www.npmjs.com/package/@expo/html-elements) or a webview ([`react-native-webview`](/versions/latest/sdk/webview/)).